1 /************************************************************************** 2 * 3 * Copyright (C) 1999 Wittawat Yamwong 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included 13 * in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * KEITH WHITWELL, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 21 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 * 23 **************************************************************************/ 24 25 26 /** 27 * @file 28 * Memory manager code. Primarily used by device drivers to manage texture 29 * heaps, etc. 30 */ 31 32 33 #ifndef _U_MM_H_ 34 #define _U_MM_H_ 35 36 37 struct mem_block { 38 struct mem_block *next, *prev; 39 struct mem_block *next_free, *prev_free; 40 struct mem_block *heap; 41 int ofs,size; 42 unsigned int free:1; 43 unsigned int reserved:1; 44 }; 45 46 47 48 /** 49 * input: total size in bytes 50 * return: a heap pointer if OK, NULL if error 51 */ 52 extern struct mem_block *u_mmInit(int ofs, int size); 53 54 /** 55 * Allocate 'size' bytes with 2^align2 bytes alignment, 56 * restrict the search to free memory after 'startSearch' 57 * depth and back buffers should be in different 4mb banks 58 * to get better page hits if possible 59 * input: size = size of block 60 * align2 = 2^align2 bytes alignment 61 * startSearch = linear offset from start of heap to begin search 62 * return: pointer to the allocated block, 0 if error 63 */ 64 extern struct mem_block *u_mmAllocMem(struct mem_block *heap, int size, int align2, 65 int startSearch); 66 67 /** 68 * Free block starts at offset 69 * input: pointer to a block 70 * return: 0 if OK, -1 if error 71 */ 72 extern int u_mmFreeMem(struct mem_block *b); 73 74 /** 75 * Free block starts at offset 76 * input: pointer to a heap, start offset 77 * return: pointer to a block 78 */ 79 extern struct mem_block *u_mmFindBlock(struct mem_block *heap, int start); 80 81 /** 82 * destroy MM 83 */ 84 extern void u_mmDestroy(struct mem_block *mmInit); 85 86 /** 87 * For debugging purposes. 88 */ 89 extern void u_mmDumpMemInfo(const struct mem_block *mmInit); 90 91 #endif 92
